So I just bought this laminate flooring for the trailer, and I'm reading the installation instructions, and of course now I have questions.

1. "...a temperature of 18-24 degrees Celsius should be kept." 

Well, this is going to be impossible.  July gets darn hot, and January is brutally cold.  My flooring is going to be experiencing temps between -40 C and +40 C.  Should I give up and return the flooring already? Has anyone got laminate flooring that experiences this kind of temp fluxuation, and how did it hold up?

2. Should I do the recommended foam underlay, or is that mostly for a sound barrier for the benefit of your home?  This is going to go over an insulated floor with plywood subfloor.  Would it squeak without the foam underlay?  It's a floating-type floor, just snaps together, no nails in the floor boards themselves.

Our temperatures vary up to a maximum of about 110 degrees F. The manufactured flooring is quite stable and will not expand and contract nearly as much as a one piece solid wood product.

We installed the flooring over felt paper, no foam, and pin nailed the perimeter to temporarily hold things into place until the shoe moulding is installed. We did not want anything that would allow moisture to become trapped between the wood flooring and sub floor. Over the course of a winter and now temps in the 80's, the flooring is intact and shows no sign of any disturbance.

There is no squeaking or any noise when walked upon. If it were damaged, this type of flooring could easily be repaired or replaced. I think you will like it.

Gard